Greasy spoon with quality ingredients cooked to harden arteries. The service was less than stellar, but the atmosphere was cozy (read: tight) and not terribly unpleasant. The food was standard tasting - this place could do with a regular deep cleaning and perhaps some attempt to de-grease the food prep. The service could also use a bit of a boost... perhaps they should partake of their own coffee - the caffeine could help wake them up a bit.
There are some great little places like this dispersed around central Phoenix that give the downtown area some great character. This one is on the low end of the group. A few small changes and this place could easily improve to a 5 star - but since it's so popular, there's hardly a reason to change anything I suppose.
I'm thankful that I live near downtown Scottsdale where awesome breakfast choices are bountiful. Matt's is worth a visit, but only just.